THE INVESTIGATION OF THE AL7075 + 1 WT. % ZR ALLOY PREPARED USING SPARK PLASMA SINTERING TECHNOLOGY

1 MOLNÁROVÁ Orsolya
Co-authors:
1 MÁLEK Přemysl 2 BECKER Hanka
Institutions:
1 Charles University in Prague, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 12116, Prague 2, Czech Republic, e-mail: malek@met.mff.cuni.cz
2 Institute of Materials Science, TU Bergakademie Freiberg, 09599 Freiberg,Germany, e-mail: *mopersze@gmail.com
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
1221-1226
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
130 views / 24 downloads
Abstract

The microstructure and mechanical properties of powder metallurgical Al7075 alloy modified by the addition of 1 wt. % Zr were studied. The gas atomized powder was consolidated by spark plasma sintering (SPS) to a fully dense compact. The powder particles of the typical size below 50 μm had a cellular to columnar or equiaxed dendritic microstructure (the size in the order of μm) with a large fraction of intermetallic phases at the boundaries. During sintering at 500 °C for 3 min the grain structure remained nearly unchanged. Optical microscopy revealed a bimodal microstructure. The grain size remained unchanged during annealing at even 500 °C for 10 hours. The microhardness of the SPS compact material was 150 HV. The annealing at 500 °C for 10 hours resulted in a decrease of microhardness to 110 HV. Natural aging at room temperature gradually enhanced the microhardness to its initial value. Tensile tests performed on naturally aged samples at room temperature revealed a brittle behaviour. Ductility of 14 % was found at 500 °C. Both the measurements of the strain rate sensitivity parameter m and results of light and scanning electron microscopy revealed the operation of grain boundary sliding.

Keywords: Al7075 alloy, zirconium, spark plasma sintering, powder metallurgy

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top